Interactive Transcript
0:01
Let's turn our attention to the extensors,
0:05
the dorsal aspect of the wrist, the posterior
0:10
aspect of the wrist, and try and match up some
0:14
of the anatomy you heard in our animation.
0:18
We start out with compartment number 1, then
0:21
2, then 3, then 4, then 5, and here's 6.
0:26
That's a little quick.
0:27
Compartment number 1, the abductor
0:31
pollicis longus, extensor pollicis brevis.
0:34
There are innumerable slips.
0:36
Look at these small little slits right
0:38
here in the abductor pollicis longus.
0:41
If this was inflamed, those slits, like
0:44
this one right here, might widen and might
0:46
be confused with a longitudinal tear.
0:49
An important pitfall.
0:51
Then we go from the abductor compartment number
0:57
one, to extensor carpi radialis longus and brevis.
1:01
So it goes longus, brevis, longus, brevis.
1:04
Now we've got to find the EPL.
1:07
Where did it go?
1:08
Well, let's go to Lister's tubercle.
1:10
There is the extensor pollicis longus.
1:12
There's Lister's tubercle.
1:15
Well, now we can try and track
1:18
the extensor pollicis longus.
1:20
Although, we're going to need some
1:22
long axis projections to help us.
1:24
That's compartment number three.
1:27
Compartment number four, the extensor
1:30
digitorum communis and indices, is a larger
1:33
compartment in which one or more tendons
1:36
may be involved in a disease process.
1:40
Then we go to the extensor digiti minimi.
1:43
Compartment number five, this is four, this is five.
1:46
And finally, to the extensor carpi ulnaris
1:50
which sits in the ulnar groove, but as stated
1:53
previously, may perch either to the radial
1:56
side or to the ulnar side depending upon
1:59
the degree of pronation and/or supination.
2:02
But we see there's nothing other than
2:04
simple lubricant around this ECU.
2:09
There's no indirect sign of an inflammatory
2:12
reaction either in the tendon or around the tendon.
2:15
Helping us decide whether the position is correct
2:18
of the extensor carpi ulnaris is physiologic or not.
2:22
We're going to get into the relationship of
2:24
the ECU and its subsheath right here and
2:29
the adjacent structures of the TFC and the
2:32
homo-lateral capsule in a separate discussion.
2:36
The extensor, dorsal, posterior compartment
2:40
highlighting the tendons of the wrist.
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